Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 131: The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the Options:
  A) Temperature of the refrigerator low and constant
  B) keep current supplied to the refrigerator below 5A
  C) Voltage supply constant
  D) Current supplies to the refrigeration
  Show Answer
  The correct answer is B .
• Question 132: Which is NOT one of the laws of solid friction? Options:
  A) The frictional force between two surfaces opposes their relative motion
  B) The ratio of frictional force to the normal reaction varies for two given surfaces
  C) The ratio of frictional force to the normal reaction is constant for two given surfaces
  D) The limiting frictional force is independent of the area of surface in contact.
  E) Dynamic frictional force is independent of the relative velocity of the surfaces in contact.
  Show Answer
  The correct answer is B .
• Question 133:

  T(oC)	0	5	10	15	20	40	60
  S.V.P (mmHg)	4.58	6.51	8.94	12.67	17.50	55.10	149.00

  The table above shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20^oC is 10mmHg, what is the relative humidity?

  Options:
  A) 170.0%
  B) 57.0%
  C) 17.5%
  D) 10.0%
  Show Answer
  The correct answer is B .
• Question 134: Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg^-1] Options:
  A) 336W
  B) 450W
  C) 560W
  D) 600W
  Show Answer
  The correct answer is C .
• Question 135: A motor vehicle is brought to rest from a speed of 15ms^-1 in 20 seconds. Calculate the retardation. Options:
  A) 0.75ms^-1
  B) 1.33ms^-2
  C) 5.00ms^-2
  D) 7.50ms^-2
  Show Answer
  The correct answer is A .
• Question 136: A gas at a volume of V₀ in a container at pressure P₀ is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant? Options:
  A) P₀/5
  B) 4P₀/5
  C) P₀
  D) 5P₀
  Show Answer
  The correct answer is D .
• Question 137: A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at Options:
  A) 0^o
  B) 45^o
  C) 90^o
  D) 180^o
  Show Answer
  The correct answer is A .
• Question 138: What type of reaction is represented by the following scheme? ${}_1^{2}X$ + ${}_1^{2}Y$ + ${}_2^{3}Z$ + ${}_0^{1}n$ + energy Options:
  A) Fusion reaction
  B) Fission reaction
  C) Chain reaction
  D) Radioactive decay
  Show Answer
  The correct answer is A .
• Question 139: After three half lifes, the fraction of a radioactive material that has decayed is Options:
  A) $\frac{1}{8}$
  B) $\frac{1}{3}$
  C) $\frac{2}{3}$
  D) $\frac{7}{8}$
  Show Answer
  The correct answer is D .
• Question 140:

  

  The figure above shows two similar bulbs X and Y connected to suitable power supply with F as an appropriate fuse rating, if the filament of X breaks then the

  Options:
  A) Brightness Of Y will reduce
  B) Brightness Of Y will remain constant
  C) Brightness Of Y will increase
  D) fuse F will blow
  Show Answer
  The correct answer is C .